
NT8D14 Universal Trunk card
Page 573 of 906
Circuit Card
Description and Installation
provides the means for analog loop terminations to establish, supervise, and
take down call connections.
Signaling interface
All trunk signaling messages are three bytes long. The messages are
transmitted in channel zero of the DS-30X in A10 format.
Configuration information for the Universal Trunk card is downloaded from
the CPU at power-up or by command from maintenance programs. Eleven
configuration messages are sent. Three messages are sent to the card to
configure the make/break ratio and A-Law or µ-Law operation. One message
is sent to each unit to configure the trunk characteristics.
Operation
Administrators can assign optional applications, features, and signaling
arrangements for each unit on the NT8D14 Universal Trunk card through the
Trunk Administration LD 14 and Trunk Route Administration LD 16
programs or jumper strap settings on the card.
Loop start operation
Loop start operation is configured in software and implemented in the card
through software download messages. When the card is idle, it provides a
high impedance toward the CO for isolation and ac (ringing) detection.
Incoming calls
The alerting signal into the System is 20 Hz (nominal) ringing sent by the CO.
When an incoming call is answered, ringing is tripped when the System
places a low-resistance dc loop across the tip and ring leads toward the CO.
See Figure 115 and Figure 116 on
page 575
.
Outgoing calls
For outgoing calls, the software sends an outgoing seizure message to place
a low-resistance loop across the tip and ring leads toward the CO. See
Figure 117 on
page 576
and Figure 118 on
page 577
. When the CO detects
the low-resistance loop, it prepares to receive digits.When the CO is ready to
Содержание Circuit Card
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Страница 546: ...Page 546 of 906 NT8D03 Analog Line card 553 3001 211 Standard 3 00 August 2005...
Страница 564: ...Page 564 of 906 NT8D09 Analog Message Waiting Line card 553 3001 211 Standard 3 00 August 2005...
Страница 626: ...Page 626 of 906 NT8D14 Universal Trunk card 553 3001 211 Standard 3 00 August 2005...
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Страница 768: ...Page 768 of 906 NTAK93 D channel Handler Interface daughterboard 553 3001 211 Standard 3 00 August 2005...
Страница 772: ...Page 772 of 906 NTBK22 MISP card 553 3001 211 Standard 3 00 August 2005...
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